- Verified to construct 3-level fat trees correctly using custom-
approach.
 - Verified to work with 2, 3 and 4 pods.

 - fattree-config-up-connections
 - sim_log.txt

  - Cleaned up connections code
  - Wrapped layout generation in #define FATTREE_CONNECTIONS
  - Replaced hard coded switch id to use r->switch_id+p->num_terminals

Replacing master with rebased_aug22 branch
  - rebased it onto latest CODES (which now needs latest ROSS)
  - added a few bug fixes

Change-Id: I4aa8fb074b9142a0bc2a2311c158a356f12f79cb

Change-Id: I31e9ca9f33dc4829e60c69baf9fca45efd7a0f62

Change-Id: I85a8e0d27966afda2dabfbc10a37f91ee838a1af

Change-Id: Ic968ed172e51862dbcfc63050f51ef0b5d01a3cf

Change-Id: I6677c21ebce465ab18ece457b839fa374615da75

Change-Id: Iea68b2f46526244d4c5f874b6f4b844af3e697f2

Change-Id: Ib1c9872d295dbd61d7e2dc16e5269f111107938b

Change-Id: If8c21b26eb9c04ee640e3ba3a4ab170a5b5e4555

- Moved switch reverse event handlers into separate functions located
before their forward counterparts.

- Initialized missing variables in terminal_init to zero
- Optimistic net events number is very close to sequential net events
- Vc_occupany and terminal_length changed to increment/decrement by
chunk_size instead of packet_size in packet_send_rc()
- Updated packet_send() to handle chunk level
- Many changes of packet_size to chunk_size

- Add injection load functionality to workload file
- Correspondingly adjusted stats collection to include load
- Cleaned up log file offsets to match header

- Stats are output to log file in modelnet-test directory
- Stats are added from terminal_final(), switch_final(), report_stats(),
and within main() of the synthetic workload file
- Stats include ROSS sim metrics (i.e. synch mode, gvt-interval,
rollbacks, etc.), as well as network params/results (i.e. num terminals,
num switches, workload, avg latency, max latency, etc)

- Moved terminal reverse event handlers into separate functions located
before their forward counterparts.
- Cleaned up previously commented code

- Cleaned packet_generate()
- Fixed bug in decrementing terminal_length

- Updated terminal packet generate rc handler
- Updated terminal packet arrive rc handler
- Added missing mn_stats
- Added DEBUG_RC flag to turn on data collection and output to tally all
forward and reverse event handlers

- Cleaned up debug printf output
- Added rc_stack_push and pop (replacing copy function)
- Deleted copy_fattree_list_entry() and
create_prepend_to_fattree_message_list() functions (functionality
replaced with rc_stack)

Added missing RC stack creation (fixes segfault in previous commit)
Cleaned up code
Needs verification

- Cleaned up handle_kickoff_event()
- UR traffic no longer generates messages with destination to self
- Added num_chunks config param (fixes segfault in hash chunk tracking)